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How does the size of the sample influence the outcome of a hypothesis test?

Statistical Methods for Psychology 1. A random sample of N = 25 individuals is selected from a population with μ = 20, anda treatment is administered to each individual in the sample. After treatment, the samplemean is found to be X = 22.2 with SS = 384. Based on the sample data, does the treatmenthave […]

What’s the evidence that there are differences of MADRS across treatment conditions?

Statistics question Read and answer Lam, Raymond W., et al. “Efficacy of bright light treatment, fluoxetine, and the combination in patients with nonseasonal major depressive disorder: a randomized clinical trial.” JAMA psychiatry 73.1 (2016): 56-63. What type of ANOVA did the authors use? What’s the evidence that there is an effect of time on MADRS? […]

Is the article stating that the two variables are correlated or that they have a causal relationship?

Assignment: Find an example of an article that that relates two variables. Is the article stating that the two variables are correlated or that they have a causal relationship? Does the article confuse correlation and causation? Discuss other variables that could contribute to the relationship between the variables.

Would you expect the standard deviation of Fund P to be less than 14%, equal to 14%, or greater than 14%?

Question and answer What is the market risk premium (rM – rRF)? Round your answer to two decimal places. What is the beta of Fund P? Do not round intermediate calculations. Round your answer to two decimal places. What is the required return of Fund P? Do not round intermediate calculations. Round your answer to […]

What happens to the width of the confidence interval as sample size increases?

Statistical Methods for Psychology1. Suppose we are sampling from a population that is known to be normal with standard devi-ation σ = 10. However, the mean μ is unknown, so we’ll have to estimate it. (a) A sample of N = 9 is drawn and is found to have mean X = 25. Compute a […]

What is the p value, and what does it mean to be statistically significant?

You have been asked to prepare a presentation for your local middle school civics class. The students have been seeing and hearing information online about statistics and statistical significance leading up to the presidential election. They are confused about what exactly that means. Prepare a short presentation that explains some foundational aspects of hypothesis testing […]

How will your choices better aid leadership in making their decision?

contract with to offer insurance to the employees. You are in charge of creating the plan for collecting the data that will be used for a statistical test to help the organization make that decision. You have been asked to present your plan and inform stakeholders about the risks you are trying to avoid so […]

What is your tentative research question based on this analysis of the issue?

Research Proposal What is the topic? Why is it significant, an interesting problem, a relevant issue, etc.? Who is your audience within or related to your discipline? What have you found out from preliminary research: what questions are being asked by scholars researching this issue now? What kinds of research (methodology) is being done to […]

What is a minimal number of wires counted from 70 a cable must have in order to maintain the reliability of the cable (and thus of the system) to at least 0.98?

1 Explain in Example 5.8 (Chapter I, pages 45-46) of the Lecture Notes (a) how A was obtained and (b) what went wrong with the Poisson approximation. (5 pts) Problem 2 is computational, and it should be rendered using the R-programming (no other language or tool). Also, your work must be rendered independently, without any […]